Thanks a lot for your prompt reply! Unfortunately, I am still experiencing difficulties when generating video files from an FDTD simulation. I set up the observation area as you described, yet no video files seem to appear after the simulation terminates. I also do not get any warnings or error messages. Would you be so kind as to take a quick look at my attached .fdt file and check if this setup works for you? Essentially, I followed along with the ring resonator tutorial and added an observation area.
I am using Windows 10 Home Version 20H2, if that is relevant. Thank you very much for your kind support!